Infant feeding: historical and current.
D000818:Animals; D001942:Breast Feeding; D005260:Female; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena / Q000266:history*; D007231:Infant, Newborn; D008297:Male; D008892:Milk